RS Zagreb was one of four clubs from Croatia that had teams playing during Partille Cup 2013. They participated with one team in Boys 15. In addition to RS Zagreb, 85 other teams from 19 different countries played in Boys 15. They were divided into 14 different groups, whereof RS Zagreb could be found in Group 11 together with HK Ankaret 2, Union West Wien, RP IF, SS Protvino City and Strömm IL. RS Zagreb continued to A-Play-off after reaching 1:st place in Group 11. In the playoff they made it to 1/8 Final, but lost it against Tyresö Handboll with 15-16. In the Final, Hjortshöj Egå IF 1 won over THW Kiel and became the winner of A-Play-off in Boys 15. RS Zagreb comes from Zagreb which lies approximately 1400 km from Göteborg, where Partille Cup takes place. The area around Zagreb does also provide three additional clubs participating during Partille Cup 2013 (RK Zagreb, RK Pavleki and RK Dubrava).